Add/remove image on button press - iphone

Question

This my tableview.i want when user press button then another image should on the top of that image and removed when again user presses wt is the code
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
CGRect prescriptionFrame=CGRectMake(100, 0, 150, 40);
UILabel *presTextLabel=[[UILabel alloc] initWithFrame:prescriptionFrame];
presTextLabel.font=[UIFont boldSystemFontOfSize:20];
CGRect tabletFrame=CGRectMake(150, 50, 100, 20);
UILabel *tabletTextLabel=[[UILabel alloc] initWithFrame:tabletFrame];
tabletTextLabel.font=[UIFont boldSystemFontOfSize:10];
CGRect noOfTabletFrame=CGRectMake(250, 40, 30, 30);
UILabel *noOfTabletTextLabel=[[UILabel alloc] initWithFrame:noOfTabletFrame];
noOfTabletTextLabel.font=[UIFont boldSystemFontOfSize:10];
cellButton = [UIButton buttonWithType:UIButtonTypeCustom];
cellButton.frame=CGRectMake(10,10 ,50,50);
presTextLabel.text=[appDelegate.prescriptionArray objectAtIndex:indexPath.row];
tabletTextLabel.text=[appDelegate.tabletArray objectAtIndex:indexPath.row];
noOfTabletTextLabel.text=[appDelegate.noOfTabletsArray objectAtIndex:indexPath.row];
[cellButton setImage:[appDelegate.imageArray objectAtIndex:indexPath.row]
forState:UIControlStateNormal];
[cellButton addTarget:self action:#selector(StartTimer)
forControlEvents:UIControlEventTouchUpInside];
cellButton.tag = indexPath.row;
[cell.contentView addSubview:presTextLabel];
[cell.contentView addSubview:tabletTextLabel];
[cell.contentView addSubview:noOfTabletTextLabel];
[cell.contentView addSubview:cellButton];
[presTextLabel release];
[tabletTextLabel release];
return cell;
}

Answer 1

In
- (void)StartTimer:(id)sender;
do
UIButton* button = (UIButton*)sender;
UITableViewCell *cell = (UITableViewCell*)[[button superview] superview];
NSIndexPath indexPath = [self.tableview indexPathForCell:cell];
if([button imageForState:UIControlStateNormal] == [appDelegate.imageArray objectAtIndex:indexPath.row]) {
[button setImage:[UIImage imageNamed:#"NEWIMAGE.png"] forState:UIControlStateNormal];
}
else {
[button setImage:[appDelegate.imageArray objectAtIndex:indexPath.row] forState:UIControlStateNormal];
}
Not tested, may include typos, but should work.
MfG,
SideSwipe